Magnetorotational instability driven dynamos at low magnetic Prandtl numbers

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Käpylä , P J & Mantere , M 2011 , ' Magnetorotational instability driven dynamos at low magnetic Prandtl numbers ' , Monthly Notices of the Royal Astronomical Society , vol. 413 , pp. 901-907 . https://doi.org/10.1111/j.1365-2966.2010.18184.x

Title: Magnetorotational instability driven dynamos at low magnetic Prandtl numbers
Author: Käpylä, Petri J.; Mantere, Maarit
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2011
Language: eng
Number of pages: 7
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/28863
Abstract: Numerical simulations of the magnetorotational instability (MRI) with zero initial net flux in a non-stratified isothermal cubic domain are used to demonstrate the importance of magnetic boundary conditions. In fully periodic systems the level of turbulence generated by the MRI strongly decreases as the magnetic Prandtl number (Pm), which is the ratio of kinematic viscosity and magnetic diffusion, is decreased. No MRI or dynamo action below Pm=1 is found, agreeing with earlier investigations. Using vertical field conditions, which allow magnetic helicity fluxes out of the system, the MRI is found to be excited in the range 0.1
Subject: astro-ph.HE
astro-ph.SR
115 Astronomy, Space science
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